1. Multifunctional: countdown, plus seconds, multi segment timing, time limit, positive timing, delay function, and mute.2. Battery power supply: The rear of the product is equipped with a dry battery installation port, as well as a power supply port. You can connect devices such as a power charger and a charging bank through a USB cable to power the product. You need to connect the power supply to use it, and you cannot store electricity.3. Widely used: suitable for multi clock chess games, such as Chinese chess, international chess, go, etc.4. Easy to use: During the competition, the parameters of both sides can be modified, and different basic time and auxiliary parameters can be set on the left and right sides.5. Big rocker key: The rocker timing key allows the person who is cocked to count, providing a , quick response, and convenient control, making it more suitable for fast chess.Type:Chess ClocksModel Number:Chess Digital TimerTwo power supply methods:DC 3V power supply (two or four batteries can be used)(Not included batteries)USB power supply (connected to the power supply, unable to store power). Colour:BlackMaterial:ABSSize:197x126x58mmPackage Contents:1 x Chess Digital Timer1 x USB CablOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.